x^2-y^2=16的极坐标方程是什么?
举一反三
- 下列哪个函数的定义域是有界集？ A: $f(x,y)=e^{-x^2-y^2}$ B: $f(x,y,z)=\sqrt{1-x^2-y^2-z^2}$ C: $f(x,y)=\ln(y-x)$ D: $f(x,y)=\sqrt{1-x^2}+\sqrt{y^2-1}$
- 计算由y=x^2与x^2=2-y所围成的图形面积
- \({\lim_{x\to0}}\)\({\lim_{y\to0}}\)xy\(\frac{x^2-y^2}{x^2+y^2}\)= <br/>______
- 已知x、y是整数，且满足方程x^2-y^2=2020，x+y可能等于（) A: 1 B: 2020 C: 2 D: 5 E: 404
- 设置选项让曲面透明和无边界框去观察马鞍面(双曲抛物面) A: Plot3D[x^2-y^2,{x,-3,3},{y,-3,3},PlotStyle→Opacity[0.2],BoxRatios→{1,1,1}] B: Plot3D[x^2-y^2,{x,-3,3},{y,-3,3},BoxRatios→{1,1,1},PlotStyle→Opacity[0.3]] C: Plot3D[x^2-y^2,{x,-3,3},{y,-3,3},PlotStyle→Opacity[1.0],BoxRatios→{1,1,1}] D: Plot3D[x^2-y^2,{x,-3,3},{y,-3,3},BoxRatios→{1,1,1},PlotStyle→Opacity[0.25]]